liendeadline-mcp

MCP server for US mechanics lien and preliminary notice deadlines. Covers all 50 states plus the District of Columbia.

Give it an invoice date and a state, get the statutory deadlines back. It wraps the public LienDeadline API, which needs no API key for these endpoints.

Install

Claude Code:

claude mcp add liendeadline -- npx -y liendeadline-mcp

Claude Desktop, in claude_desktop_config.json:

{
  "mcpServers": {
    "liendeadline": { "command": "npx", "args": ["-y", "liendeadline-mcp"] }
  }
}

No account or API key required.

Related MCP server: JP Business Calendar MCP

Tools

Example

calculate_lien_deadline with state: "TX", invoice_date: "2026-07-01", project_type: "Commercial":

{
  "state": "TX",
  "invoice_date": "2026-07-01",
  "preliminary_notice_deadline": "2026-09-15",
  "lien_deadline": "2026-10-15",
  "prelim_deadline_days": 18,
  "lien_deadline_days": 48,
  "warnings": ["If 15th falls on weekend/holiday, extends to next business day"]
}

get_state_lien_guide returns the rule behind that date, including "statute": "Texas Property Code § 53.056", so an answer can be checked rather than trusted.

Notes

Two deliberate choices worth knowing about:

• Responses are trimmed. The calculate endpoint returns the same object three times, and a state guide is ~16 KB of which roughly 7 KB is rendered HTML. Both are collapsed to the fields an agent can act on, which takes a guide from ~16,000 to ~4,300 characters.

• Point it elsewhere with LIENDEADLINE_API_URL if you need staging.

Not legal advice

Results are calculated estimates from published state rules, reviewed quarterly. Statutes change and facts vary between projects. Verify critical deadlines with counsel before relying on them. This is not a law firm and does not file anything on your behalf.

Licence

MIT